#include "Nguoi.h"
#include "NguoiAnh.h"
#include "NguoiViet.h"
#include "conio.h"
int main()
{
	Nguoi*n;
	NguoiViet nv;
	NguoiAnh na;
	n = &nv;
	n->Chao();
	n = &na;
	n->Chao;
	_getch();
}